Send http POST request with request body with SSL certificate

 Thank you for providing additional information. If your security certificate is in .cer format and no password is required, you can use the following code to add the certificate to your HTTPS request:

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.security.KeyStore;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

public class HttpsRequestWithCertificate {

    public static void main(String[] args) {
        try {
            // Load the certificate from a file
            String certificatePath = "path/to/certificate.cer";
            CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
            FileInputStream fis = new FileInputStream(certificatePath);
            X509Certificate certificate = (X509Certificate) certificateFactory.generateCertificate(fis);
            fis.close();

            // Create a TrustManager that trusts the certificate
            TrustManager[] trustManagers = new TrustManager[]{
                    new X509TrustManager() {
                        public X509Certificate[] getAcceptedIssuers() {
                            return new X509Certificate[]{};
                        }

                        public void checkClientTrusted(X509Certificate[] certs, String authType) {
                        }

                        public void checkServerTrusted(X509Certificate[] certs, String authType) {
                            for (X509Certificate cert : certs) {
                                if (cert.equals(certificate)) {
                                    return; // Certificate is trusted
                                }
                            }
                            throw new IllegalArgumentException("Certificate is not trusted.");
                        }
                    }
            };

            // Create the SSL context and configure it with the TrustManager
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustManagers, new java.security.SecureRandom());

            // Set the default SSLSocketFactory for HttpsURLConnection to use our SSL context
            HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());

            // URL of the API endpoint
            URL url = new URL("https://example.com/api/endpoint");

            // Create a connection
            HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();

            // Set the request method to POST (or GET/PUT/DELETE as needed)
            connection.setRequestMethod("POST");

            // Set other request headers, if required
            connection.setRequestProperty("Content-Type", "application/xml");
            connection.setRequestProperty("Authorization", "Bearer YOUR_ACCESS_TOKEN");

            // Enable output and input for the connection
            connection.setDoOutput(true);
            connection.setDoInput(true);

            // Create the request body as per your API requirements
            String requestBody = "<request>YOUR_REQUEST_DATA</request>";

            // Write the request body to the connection's output stream
            try (java.io.OutputStream outputStream = connection.getOutputStream()) {
                byte[] requestBodyBytes = requestBody.getBytes();
                outputStream.write(requestBodyBytes, 0, requestBodyBytes.length);
            }

            // Get the response code
            int responseCode = connection.getResponseCode();

            // Read the response body (XML)
            if (responseCode == HttpsURLConnection.HTTP_OK) {
                try (BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
                    StringBuilder response = new StringBuilder();
                    String inputLine;
                    while ((inputLine = in.readLine()) != null) {
                        response.append(inputLine);
                    }

                    // Process the XML response as needed
                    String xmlResponse = response.toString();
                    System.out.println(xmlResponse);
                }
            } else {
                // Handle HTTP response code other than 200 OK
                System.out.println("HTTP Error Code: " + responseCode);
            }

            // Close the connection
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

In this code, replace `"path/to/certificate.cer"` with the actual path to your .cer certificate file. The certificate is loaded using `CertificateFactory` and then added to the `TrustManager` array, which allows the connection to trust the specified certificate.

Please note that trusting a certificate blindly without proper verification may pose security risks. In production environments, it is recommended to properly validate the certificate chain and check its authenticity.

With this code, your HTTPS request should use the specified certificate for communication with the server.